#1.
Company - singular, companies - plural
This is when you are talking about A company (like a business).
Ex. The company was awarded the Safest Car of the Year certificate.
Ex. The two companies have been competing against each other for years.
If you ever mean "company" as in the presence of another person, it's always singular.
My boyfriend's company - singular, my family's company - singular, their company - singular
Ex. I really appreciated their company around the holidays. OR (less natural but just for an example) Their company was (not "were") much appreciated around the holidays.
:)